Improvement in lifting-jacks



or jack proper. 'cessed at G on the opposite side thereof, to

rrnn STATES OZRO A. EDGERTON, OF MORRISVILLE, VERMONT.

' 'IMPROVEMENT IN LlFTlNC-i-JACKS.

Specification forming part of Letters Patent No. 1 84,850, datedNovember 28, 1876; application filed October 28, 1876.

To an whom it may concern Be it known that I, OZRO A. EDGERTON, ofMorrisville, in the county of Lamoille and State of Vermont, haveinvented a new and valuable Improvement in Lifting-Jacks; and I dohereby declare that the following is a full, clear, and exactdescription of the construction and operation of the same, referencebeing had to the annexed drawings, making a part of this specification,and to the letters and figures of reference marked thereon.

Figure 1 of the drawings is arepresentation of a longitudinal section ofmy lifting-jack, and Fig. 2 is a perspective view of myjack proper. Fig.3 is a detail view of the same.

. This invention relates to lifting-jacks for carriages and wagons; andit consists in combining with a pivoted handle and slidingjack anoscillating; connecting-bar, which operates to diminish friction inraising said jack, and

also to sustain the same firmly in an elevated position.

In the annexed drawing, A designates a bed-piece or bottom-block, onwhich is secured an upright casing, B, within which casing is a loosesu1' porting-slide or jack proper, O. Said slide or jack is provided ontop with a succession of steps, 0 c, adapting the same to be used withaxles of various heights above the ground, and it receives verticalreciprocatory motion from a lever-handle, D, which is pivoted withinsaid casing B, its long arm being outward. The end of the short innerarm of said lever-handle is connected to the lower part of slide (3 onthe opposite side thereof by a bar or connecting-rod, E, which ispivotally attached at both ends. Said rod is straight, except near itsupper end, where it curves slightly toward the pivot of saidlever-handle, and the said straight part vibrates backward and forward(when said lever-handle is raised or lowered) in a long narrowdownwardly-tapering recess, 0, of said slide Said slide or jack is alsoreallow the upward and downward play of lever-handle D. Said recessesare connected at 0 forming an irregular opening through said slide,which allows the backward and forward motion of the upper end of bar orconnecting-rod E, and also allows said slide to move upward and downwardwithout being incommoded by the pivot-pin F of said leverha-ndle. Saidpin extends across casing A from side to side thereof. The attachment ofbar or connecting-rod E is effected by means of cylindrical studs orlugs e e, which arev made solid therewith, and enter cylindricalrecesses f in said slide and lever-handle. The recess f in said slide isshown in Fig. 2. The construction of said bar or connecting-rod is shownin Fig. 3.

When the outer end of lever-handle D is lowered, the inner endnecessarily rises, transmittin g upward motion, through bar E, to slideor jack 0. The doubly-pivotal attachment of said rod allows said slideto be forced directly upward, with but a very slight degree of friction.When the upper attachment of said bar or rod E reaches or passes beyonda point above the pivot of lever-handle D, slide or jack 0 is locked, soas to resist any downward force or weight; but when the outer end ofsaid leverhandle is raised, so as to cause said point of attachment topass forward beyond a vertical line drawn through said pivotal point ofsaid ing recesses O G, and opening 0 with leverhandle D, andconnecting-bar E, substantially as set forth.

In testimony that I claim the above I have hereunto subscribed my namein the presence of two witnesses.

OZRO A. EDGERTON.

Witnesses:

ORLO OADY, A. M. BURKE.

